Like if you own a property, your property papers shows its your property. No-one can claim that it's their property, not yours because you are the one got papers.
Anyway, what shows your authority on a domain name? I know the whois record has got all the info about the domain owner, but what is the important thing in the records that if you lose it, you can lose your domain?
Is it the email or home address? What is main thing?
e.g. If my email is hacked then can the hacker could claim my domain name or if I move to a new house and the people shifted in that house can they claim the domain name?